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On Noncommutative Sinh-Gordon Equation

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Chinese Physics Letters 2005年第5期22卷 1076-1078页

作者： U.saleem m.Siddiq m.Hassan DepartmentofPhysics UniversityofthePunjabQuaid-e-AzamCampusLahore-54590Pakistan

We give a noncommutative extension of a sinh-Gordon equation. We generalize alinear system and Lax representation of the sinh-Gordon equation in noncommutative space. Thisgeneralization gives a noncommutative version ... 详细信息

关键词： currents Linear system Generalization gordon's formula water currents

Gravitomagnetic Effects on Collective Plasma Oscillations in Compact Stars

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Communications in Theoretical Physics 2006年第3期45卷 568-572页

作者： Babur m. mirza Hamid saleem Depaxtment of mathematics Quaid-i-Azam University Islamabaci 45320 Pakistan PINSTECH Nilore Islamabad Pakistan COmSATS Institute of Information Technology Islamabad Pakistan

The effects of gravitomagnetic force on plasma oscillations are investigated using the kinetic theory of homogeneous electrically neutral plasma in the absence of external electric or magnetic field. The random phase assumption is employed neglecting the thermal motion of the electrons with respect to a fixed ion background. It is found that the gravitomagnetic force reduces the characteristic frequency of the plasma thus enhancing the refractive index of the medium. The estimates for the predicted effects are given for a typical white dwarf, pulsar, and neutron star.

关键词： gravitomagnetism compact stars plasma osillations

Heat transfer and Helmholtz-Smoluchowski velocity in Bingham fluid flow

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Applied mathematics and mechanics(English Edition) 2020年第8期41卷 1167-1178页

作者： A.saleem m.N.KIANI S.NADEEm A.ISSAKHOV mathematics and Its Applications in Life Sciences Research Group Ton Duc Thang UniversityHo Chi Minh 7000Vietnam Faculty of mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh 7000Vietnam Department of mathematics Quaid-i-Azam UniversityIslamabad 44000Pakistan Faculty of mechanics and mathematics Al-Farabi Kazakh National UniversityAlmaty 0500Kazakhstan

A mathematical study is developed for the electro-osmotic flow of a nonNewtonian fluid in a wavy microchannel in which a Bingham viscoplastic fluid model is *** electric potential distributions,a Poisson-Boltzmann equation is employed in the presence of an electrical double layer(EDL).The analytical solutions of dimensionless boundary value problems are obtained with the Debye-Huckel theory,the lubrication theory,and the long wavelength *** effects of the Debyelength parameter,the plug flow width,the Helmholtz-Smoluchowski velocity,and the Joule heating on the normalized temperature,the velocity,the pressure gradient,the volumetric flow rate,and the Nusselt number for heat transfer are evaluated in detail using *** analysis provides important findings regarding heat transfer in electroosmotic flows through a wavy microchannel.

关键词： electro-osmosis Bingham viscoplastic fluid electric double layer(EDL) heat transfer Joule heating

Physical aspects of anisotropic compact stars in f(T,T) gravity with off diagonal tetrad

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Chinese Physics C 2021年第8期45卷 190-205页

作者： m.Zubair Allah Ditta G.Abbas Rabia saleem Department of mathematics COMSATS University IslamabadLahore CampusLahorePakistan Department of mathematics The Islamia University of BahawalpurBahawalpurPakistan

This study addresses the formation of anisotropic compact star models in the background of f(T,T)gravity(where T and T represent the torsion and trace of the energy momentum tensor,respectively).f(T,T)gravity is an extension of the f(T)theory,and it allows a general non-minimal coupling between T and *** this setup,we apply Krori and Barua's solution to the static spacetime with the components ξ=Br^(2)+c and ψ=Ar^(2).To develop viable solutions,we select a well-known model f(T,T)=αT^(m)+βT+Ф(where α and β are coupling parameters,and Ф indicates the cosmological constant).We adopt the conventional matching of interior and exterior space time to evaluate the unknowns,which are employed in the stellar *** present a comprehensive discussion on the stellar properties to elaborate the anisotropic nature of compact stars corresponding to well-known models:PSRJ1416-2230,4U1608-52,CenX-3,EXO1785-248,and *** physical analysis,it is observed that the solution of compact spheres satisfy the acceptability criteria,and its models behave optimally and depict stability and consistency,in accordance with f(T,T)gravity.

关键词： f(T,T)gravity compact stars stellar models

mICELLIZATION STUDIES OF DODECYL BENZENESULFONIC ACID AND ITS INTERACTION WITH POLYVINYLPYRROLIDONE

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Chinese Journal of Polymer Science 2005年第1期23卷 29-35页

作者： mohammad saleem Khan Zarshad Ali National Centre of Excellence in Physical Chemistry University of PeshawarPeshawar 25120PakistanNational Centre of Excellence in Physical ChemistryUniversity of PeshawarPeshawar 25120Pakistan

Dodecyl benzenesulfonic acid(DBSA)surfactant was used in the present study to find the effect of concentrationon its electrical conductance in solution from 293-323 K above and below the critical micelle concentration(CmC).Themicellization parameters *** of counter ion binding(β),aggregation number(n)and number of counter ion micelle(m)were *** interaction of DBSA with polyvinylpyrrolidone(PVP)was also studied at 293 K throughconductance and surface tension measure ments.A number of important parameters *** aggregation concentration(CAC),Gibb's free energy(△G)and binding ratio(R)were determined and the effect of NaCl on the CAC and polymersaturation point(PSP)was also investigated.

关键词： micellization PVP Interaction Dodecyl benzene sulfonic acid(DBSA).

The effect of Urban Heat Island mitigation strategies on outdoor human thermal comfort in the city of Baghdad

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Frontiers of Architectural Research 2021年第4期10卷 838-856页

作者： Aws m.Salman Younis m.saleem Department of Architecture Engineering University of TechnologyAl Sinaa StreetBaghdad10066Iraq

Todays,most Iraqi cities suffer from extremely hot-dry climate for long periods throughout the ***,most urban patterns that exist inside these cities are not suitable for this harsh conditions and lead to an increase in the value of the Urban Heat Island(UHI)***,this will increase outdoor human thermal discomfort as well as energy consumption and air pollution in *** study attempts to evaluate the effect of UHI mitigation strategies on outdoor human thermal comfort in three different common types of urban patterns in the biggest and most populated city in Iraq,*** different mitigation strategies are used here-vegetation,cool materials,and urban geometry-to build 18 different ***-dimensional numerical software ENVI-met 4.2 is utilised to analyse and assess the studied *** input data for simulations process are based on two meteorological stations in Baghdad:Iraqi meteorological Organization&Seismology,and Iraqi Agrometeorological *** measurements are taken in a pedestrian *** results of different scenarios are compared based on their effect on human thermal *** thermal comfort is assessed according to Predicted mean Vote index,as mentioned in ISO 7730 *** study provides a better understanding of the role of UHI mitigation strategies on human thermal comfort in the outdoor spaces of Baghdad’s residential *** can help generate guidelines of urban design and planning practices for better thermal performance in hot and dry cities.

关键词： ENVI-met Human thermal comfort UHI mitigation strategies Urban microclimate Predicted mean vote

Surface-type humidity sensor based on cellulose-PEPC for telemetry systems

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Journal of Semiconductors 2011年第1期32卷 103-107页

作者： Kh.S.Karimov m.saleem T.A.Qasuria m.Farooq GIK Institute of Engineering Sciences and Technology physical Technical Institute Aini St.299/1Dushanbe734063Tajikistan

Au/cellulose-PEPC/Au surface-type humidity sensors were fabricated by drop-casting cellulose and poly-N-epoxypropylcarbazole （PEPC） blend thin films. A blend of 2wt% of each cellulose and PEPC in benzol was used for the deposition of humidity sensing films. Blend films were deposited on glass substrates with preliminary deposited surface-type gold electrodes. Films of different thicknesses of cellulose and PEPC composite were deposited by drop-casting technique. A change in electrical resistance and capacitance of the fabricated devices was observed by increasing the relative humidity in the range of 0-95% RH. It was observed that the capacitances of the sensors increase, while their resistances decrease with increasing the relative humidity. The sensors were connected to op-amp square wave oscillators. It was observed that with increasing the relative humidity, the oscillator＇s frequencies were also increased in the range of 4.2-12.0 kHz for 65μm thick film sample, 4.1-9.0 kHz for 88μm thick film sample, and 4.2-9.0 kHz for 210μm sample. Effects of film thickness on the oscillator＇s frequency with respect to humidity were also investigated. This polymer humidity sensor controlled oscillator can be used for short-range and long-range remote systems at environmental monitoring and assessment of the humidity level.

关键词： surface-type sensor: cellulose poly-N-epoxvoropylcarbazole humidity sensor controlled oscillator

Structural and magnetic Studies of Zn_(0.95)Co_(0.05)O and Zn_(0.90)Co_(0.05)Al_(0.05)O

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Chinese Physics Letters 2011年第11期28卷 178-181页

作者： murtaza saleem Saadat A.Siddiqi Shahid Atiq m.Sabieh Anwar Centre of Excellence in Solid State Physics University of the PunjabQuaid-e-Azam CampusLahore-54590Pakistan Interdisciplinary Research Centre in Biomedical materials(IRCBm) COMSATS Institute of Information TechnologyDefence RoadOff Raiwind RoadLahorePakistan School of Science and Engineering(SSE) Lahore University of Management Sciences(LUMS)Opposite Sector UD.H.A.Lahore-54792Pakistan

Single-phase Zn_(0.95)Co_(0.05)O and Zn_(0.90)Co_(0.05)Al_(0.05)O samples were prepared by a novel combustion *** diffraction studies exhibit the pure phase wurtzite structure of doped *** dispersive x-ray analysis confirms the incorporation of dopants into the host *** electron microscopy shows the ordered morphology in both of the ***-dependent resistivity analysis describes the expected semiconducting behavior that is similar to the parent ZnO ***-temperature magnetic measurements reveal the absence of ferromagnetism in Co-doped ZnO,while the Co and Al co-doped sample displays apparent room-temperature ferromagnetic *** decrease of resistivity and presence of ferromagnetic behavior in Al-doped ZnCoO system corroborate the significant role of free carriers.

关键词： resistivity ferromagnetic behavior

Axisymmetric Powell-Eyring fluid flow with convective boundary condition: optimal analysis

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Applied mathematics and mechanics(English Edition) 2016年第7期37卷 919-928页

作者： T.HAYAT S.mAKHDOOm m.AWAIS S.saleem m.m.RASHIDI Department of mathematics Quaid-i-Azam University Department of mathematics COMSATS Institute of Information Technology Department of mathematics Statistics and Physics Qatar University Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal management Systems Tongji University

The effects of axisymmetric flow of a Powell-Eyring fluid over an impermeable radially stretching surface are presented. Characteristics of the heat transfer process are analyzed with a more realistic condition named the convective boundary condition. Governing equations for the flow problem are derived by the boundary layer approximations. The modeled highly coupled partial differential system is converted into a system of ordinary differential equations with acceptable similarity transformations. The convergent series solutions for the resulting system are constructed and analyzed. Optimal values are obtained and presented in a numerical form using an optimal homotopy analysis method （OHAm）. The rheological characteristics of different parameters of the velocity and temperature profiles are presented graphically. Tabular variations of the skin friction coefficient and the Nusselt number are also calculated. It is observed that the temperature distribution shows opposite behavior for Prandtl and Biot numbers. Furthermore, the rate of heating/cooling is higher for both the Prandtl and Biot numbers.

关键词： axisymmetric flow optimal homotopy analysis method (OHAm) analysis,convective boundary condition